221666484 has 36 divisors (see below), whose sum is σ = 560073696. Its totient is φ = 68204448.

The previous prime is 221666449. The next prime is 221666507. The reversal of 221666484 is 484666122.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52624 + ... + 56679.

Almost surely, 2^221666484 is an apocalyptic number.

It is an amenable number.

221666484 is an abundant number, since it is smaller than the sum of its proper divisors (338407212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221666484 is a wasteful number, since it uses less digits than its factorization.

221666484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109336 (or 109321 counting only the distinct ones).

The product of its digits is 110592, while the sum is 39.

The square root of 221666484 is about 14888.4681549178. The cubic root of 221666484 is about 605.2015211013.

The spelling of 221666484 in words is "two hundred twenty-one million, six hundred sixty-six thousand, four hundred eighty-four".